Radio Receivers If a FET is used as the first AF amplifier in a transistor receiver, this will have the effect of Improving the selectivity of the receiver Reducing the effect of noise at low modulation depths Improving the effectiveness of the AGC Reducing the effect of negative-peak clipping Improving the selectivity of the receiver Reducing the effect of noise at low modulation depths Improving the effectiveness of the AGC Reducing the effect of negative-peak clipping ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers The typical squelch circuit cuts off An IF amplifier when the AGC is minimum an audio amplifier when the carrier is absent RF interference when the signal is weak An IF amplifier when the AGC is maximum An IF amplifier when the AGC is minimum an audio amplifier when the carrier is absent RF interference when the signal is weak An IF amplifier when the AGC is maximum ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers To prevent overloading of the IF amplifier in a receiver, one should use Variable selectivity Squelch Variable sensitivity Double conversion Variable selectivity Squelch Variable sensitivity Double conversion ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers The controlled oscillator synthesizer is sometimes preferred over the direct one because It does not require crystal oscillator It is a simpler piece of equipment Its frequency stability is better It is relatively free of spurious frequency It does not require crystal oscillator It is a simpler piece of equipment Its frequency stability is better It is relatively free of spurious frequency ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers The frequency generated by each decade in a direct frequency synthesizer is much higher than the frequency shown; this is done to Reduce the number of decades Increase the frequency stability of the synthesizer Reduce the number of crystals required Reduce the spurious frequency problem Reduce the number of decades Increase the frequency stability of the synthesizer Reduce the number of crystals required Reduce the spurious frequency problem ANSWER DOWNLOAD EXAMIANS APP
Radio Receivers The image frequency of a superheterodyne receiver Is independent of the frequency to which the receiver is tuned Is not rejected be the IF tuned circuits Is due to insufficient adjacent channel rejection Is created within the receiver itself Is independent of the frequency to which the receiver is tuned Is not rejected be the IF tuned circuits Is due to insufficient adjacent channel rejection Is created within the receiver itself ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS